The docker push command is used to push an image or a repository to a registry, such as Container Registry. You can specify the hostname to indicate where the image will be stored. For multi-region storage, use these prefixes:

• gcr.io: Hosts images in data centers in the United States, with possible future location changes.
• us.gcr.io: Hosts images in data centers in the United States, in a separate storage bucket from gcr.io.
• eu.gcr.io: Hosts images in the European Union.
• asia.gcr.io: Hosts images in data centers in Asia.

The Docker credential helper is the simplest method to configure Docker for direct authentication with Container Registry. After configuration, you can use the docker command to tag, push, and pull images. Alternatively, client libraries or direct interaction with the Docker API can be used for managing container images.